Pump for refrigerating apparatus



y 1930. J. G. KING ET AL 1,768,610

PUMP FOR REFRIGERATING APPARATUS I l Original Filed May '7, 1925 2Sheets-Sheet l 97/15. 1 I gwvenlow J. G. KING ET AL 1,768,610

NC: APPARATUS July 1; 1930.

MP FOR REFRIGERATI inai Filed May '7, 1

923 2 Sheets-Sheet 2 Ori M U \m Patented July 1, 1935 emw snares earsnrcaries JESSE eQ mite AND HARRY .B. Hornet" DAYTON", OHIO, ASSIGNQES, BYJnnsnn ASSIGNMENTS, TO GENERAL MOTORS MICHIGAN, A CORPORATION OFDELAWARE EESEARCE CORPORATION, I O]? DETROIT,

PUMP FOR'REFRIGERATING APPARATUS Original application filed May 7, 1923,

' 1924. Serial The present invention is not limited to but isparticularly applicable to that type of compressor in which the mediumto be compressed, does not enter the crank case of the compressor, inwhich type of compressor the crank case is sealed from the chamberswhich receive the medium by a metal bellows. One of the objects of thepresent invention is to lubricate the mech-' anism within said chambers.

Further objects and advantages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings, wherein a preferred form of the present invention is clea lyshown.

In the drawings:

Fig. 1 is a sectional view of the improved compressor taken on lines 1-1and 1-1' structure including a compressor EPOItlOIl.

21, a fan portion 22, and a motor 23 for driving said elements. Theinlet to the compressor 21 is connected by a valve block 72 with pipe24, which in turn is connected to an expansion chamber 30. The outletsof the compressor are connected by apipe 65 with a refrigerant condenser81 which in turn is connected with the expansion chain ber 30 by a pipe25. The compressed refrigerant within the condenser 81 iscooled by airexpelled from the fan-portion 22.

The unitary structure comprising the refrigerating mechanism which isconnected with an expansion chamber 30 includes a' main frame 40. Theframe 40'includes end walls 40 and 40 and a top wall 40 enclos-' ing agear housing 41. Top wall 40 is apertured to permitparts of theoperating mech- Serial No. 637,186. lliivitled. and-this applicatienfiled August 25,

anism to extend into the housing. The frame 40 supports a cylinder block42 including horizontally disposed cylinders 43 and 44 provided withradiating. fins 45 and 46. Pistons 47 and 48 reciprocate respectively inthe cylinders 43 and 44. Each piston is provided with a valve seat 49adapted to be engaged by valve 50 provided at each end of a connectingrod 51. Each piston is provided with inwardly extending annular flanges52 and 53 for guiding a connecting rod 51. Between the flange 52 and theseat 49 there is provided an annular groove 54. Communication betweenthe groove 54 and arefrigerant chamber 55 provided within the'cy'linderblock 42 is provided by the transverse passages 56 and 57 and thelongitudinally extending bore 58 provided at each end of the connectinrod 51. As shown in Fig. 2 the piston 4% is pushed to the left by theenga ement of valve 50 with its seat 49 when t e .rod 51 moves to theleft. When the rod 51 moves to the right it first engages a disc 60surrounding the rod 51 and secured in position by means of screws 61.The heads of screws 61 arespaced from the inner end of the Zpiston 47 soas to allow the disc 60 to be separated from the piston by a slightamount. When the connecting rod 51 moves to'the rightin Fig. 2 it willfirst move without moving the piston 47 until it has engaged the Washeror disc 60, and disc 60 has engaged the heads of screws 61. At thisinstant the valve 50 will be moved away fromcause it to be forced outagainst the action of as ring-pressed valve 62 and then out throng anoutlet opening 63. A counterpart of this opening is shown at 63*, at thehead end of cylinder 44. These outlets are connected with the commonpipe 65 which leads to the condenser 81.

The inlet for refrigerating gas into the compressor is provided'at thetop of the s v c linder block 42 instead of through a side t ereof ashas been the custom. The top wall of block 42 is provided with an.opening 70 in communication with a passage 71 in a valve block 72 of ashut off valve attached by screws 73 to the cylinder block 42. The valveblock 72 carries a coupling 98, the inner end of which provides thevalve seat 74 cooperating with a manuallvoperable' 76 for repump unitincludes the field frame 110 at-- tachedby screws 111- to the frame 40and sup orting pole icces 112 and field magnet win ings 1,13. he shaft104 supports an armature 114 which overhangs the right of the end wallof frame 40 as viewed in Fig 2. 7

he shaft 104 is provided with two bearings 105 and 106 and the left-handoverhan in end of the shaft supports the fan whi e t e right-handoverhanging-end supports the armature. The shaft 104 is providedintermediate its bearings 105 and 106 with gear teeth 120 meshing with agear 121 attached to a crank shaft including a crank pin 130 on which anut 131 is threaded for retaining aball bearing 132 in position, theouter race 133 of which is engaged by the forked end 134 of a-rockinglever 135 which is mounted on a pin 136 supported on lugs 137 and 138extending upwardly from a fulcrum plate 139 and spaced apartto-re ceivethe lever 135. The fulcrum plate 139 is secured to the cylinder block 42byscrews 140.

In order to seal the cylinder block 42 where the rocker lever 135extends into it there is provided a flexible diaphragm or bellows 141having its upper end permanent-' ly attached to washer 142 clampedagainst a shoulder 143 of lever 135 by a nut 144,

there being a packing ,ring 145 between the washer 142 and the shoulder143. The lower end of the bellows 141 is permanently secured to anapertured disc 146 attached by screws 147 to the cylinder block 42,there being .a packing ring 148-between the disc 146 and the bottom ofthe block 42. The fulcrum in 136 and the bellows 141 are so related t atthe lever 135 rocks about an axis midway between the ends of thebellows. In this way the bellows is not subjected to excessive sidestrain.

The upper end of the rocking bar 135 is provided with a cylindricalportion 150 which receives a block 151 having arcuate ends 152 adaptedto be received by a notch 153 provided in the connecting rod 51, the

inssgeio ends of the notch: 153 being curved to receive the arcuatesurfaces of the block 151.

Through the train of gearing and rocking leverdescribed the pump rod 51will be reciprocatedand the blower 100 will be revolved when the motorisoperated. A. 'quan tity of lubricant is placed within the gear housingor crank case 41 for lubricating the mechanism therein. I g

A. certain amount of lubricant is placed in the refrigerant system forlubricating the cylinder walls and piston. The inlet of refrigerant tothe coinpressor is located above rocking bar 135 and the oil in therefrigerant can drop directly upon the block 151 and notch 153 forlubricating the contacting surfaces thereof.

While the form of mechanism herein shown and described constitutes apreferred embodiment of one form of invention, it is to be understoodthat other forms might be adopted and various changes and alterationsmade in the shape, size and proportion of the elements therein withoutdeparting y from the spirit and scope of the invention.

What is claimed is as follows:

Apparatus of the character described comprising, in combination, adisplacement chamber having an outlet for as and liquid lubricant, acircuit having its inlet connected with the displacement chamber andadapted to receive both gas and liquid lub- I ricant from thedisplacement chamber, displacement means cooperating with thedisplacement chamber, a receiving chamber communicating with thedisplacement cham: ber, mechanism within the receiving chamber foroperating the displacement means, the outlet of said circuit beingconnected with the receiving chamber and said circuit being adapted toreturn the gas and the liquid lubricant to'the receiving chamber, saidoutlet being in a position to feed the liquid lubricant by gravity tosaid mechanism.

In testimony whereof we hereto-affix our signatures.

JESSE G. KING. HARRY B. HULL.

